android RestClientException:找不到合适的HttpMessageConverter

Question

我使用spring android rest template,并试图JSON响应转换成Java类如图所示这里.

这是我试图完成工作的片段:

    RestTemplate restTemplate = new RestTemplate();
    restTemplate.getMessageConverters().add(new MappingJacksonHttpMessageConverter());

    //I have already tried to manually setting converters with no luck
    //List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();
    //messageConverters.add(new MappingJacksonHttpMessageConverter());
    //messageConverters.add(new FormHttpMessageConverter());
    //messageConverters.add(new StringHttpMessageConverter());
    //restTemplate.setMessageConverters(messageConverters);

    Result result = restTemplate.getForObject(url, Result.class);

我认为我已经完成了所需的一切,因为它在文件中被告知:

• 我在我的类路径中有以下jar
  • 杰克逊 - 全1.7.6.jar
  • 弹簧Android的休息模板,1.0.0.M2.jar
• 在url真正返回一个JSON对象.
• 我的Result班级是一个包含所有必填字段的POJO

基本上Jackson dependencies我的classpath必须足以让它工作,因为它说:

创建新的RestTemplate实例时,有条件地加载MappingJacksonHttpMessageConverter.如果在类路径中找到Jackson依赖项,则将自动添加消息转换器并可用于REST操作.

所以我在这里失踪了,我做错了什么？

谢谢

完整例外可以在这里找到:

04-20 04:25:52.706: ERROR/AndroidRuntime(9638): FATAL EXCEPTION: main
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): java.lang.IllegalStateException: Could not execute method of the activity
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at android.view.View$1.onClick(View.java:2083)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at android.view.View.performClick(View.java:2421)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at android.view.View$PerformClick.run(View.java:8869)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at android.os.Handler.handleCallback(Handler.java:587)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at android.os.Looper.loop(Looper.java:143)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at android.app.ActivityThread.main(ActivityThread.java:5068)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at java.lang.reflect.Method.invokeNative(Native Method)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at java.lang.reflect.Method.invoke(Method.java:521)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at dalvik.system.NativeStart.main(Native Method)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): Caused by: java.lang.reflect.InvocationTargetException
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at xxx.SamplePageActivity.doRest(SamplePageActivity.java:83)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at java.lang.reflect.Method.invokeNative(Native Method)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at java.lang.reflect.Method.invoke(Method.java:521)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at android.view.View$1.onClick(View.java:2078)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     ... 11 more
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): Caused by: org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [[Lxxx.SamplePageActivity$Result;] and content type [application/json;charset=UTF-8]
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:77)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:449)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:404)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:202)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638):     ... 15 more

Answer 1

我从未在 Android 上做过任何事情，但我知道转换者对 Content-Type 很挑剔。为了使 Jackson 正常工作，消息正文需要具有“Content-Type: application/json ”。尝试检查响应中的所有标头。